Buggy code:
public class ForeachStatement extends Statement { public LocalDeclaration elementVariable ; public int elementVariableImplicitWidening = - 1 ; public Expression collection ; public Statement action ; private int kind ; private static final int ARRAY = 0 ; private static final int RAW_ITERABLE = 1 ; private static final int GENERIC_ITERABLE = 2 ; private TypeBinding iteratorReceiverType ; private TypeBinding collectionElementType ; private BranchLabel breakLabel ; private BranchLabel continueLabel ; public BlockScope scope ; public LocalVariableBinding indexVariable ; public LocalVariableBinding collectionVariable ; public LocalVariableBinding maxVariable ; private static final char [ ] SecretIndexVariableName = "<seq2seq4repair_space>index" . toCharArray ( ) ; private static final char [ ] SecretCollectionVariableName = "<seq2seq4repair_space>collection" . toCharArray ( ) ; private static final char [ ] SecretMaxVariableName = "<seq2seq4repair_space>max" . toCharArray ( ) ; int postCollectionInitStateIndex = - 1 ; int mergedInitStateIndex = - 1 ; public ForeachStatement ( LocalDeclaration elementVariable , int start ) { } public FlowInfo analyseCode ( BlockScope currentScope , FlowContext flowContext , FlowInfo flowInfo ) { breakLabel = new BranchLabel ( ) ; continueLabel = new BranchLabel ( ) ; <START_BUG> this . collection . checkNPE ( currentScope , flowContext , flowInfo , true ) ; <END_BUG> flowInfo = this . elementVariable . analyseCode ( scope , flowContext , flowInfo ) ; FlowInfo condInfo = this . collection . analyseCode ( scope , flowContext , flowInfo . copy ( ) ) ; condInfo . markAsDefinitelyAssigned ( this . elementVariable . binding ) ; this . postCollectionInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( condInfo ) ; LoopingFlowContext loopingContext = new LoopingFlowContext ( flowContext , flowInfo , this , breakLabel , continueLabel , scope ) ; UnconditionalFlowInfo actionInfo = condInfo . nullInfoLessUnconditionalCopy ( ) ; FlowInfo exitBranch ; if ( ! ( ( ( action ) == null ) || ( ( action . isEmptyBlock ( ) ) && ( ( currentScope . compilerOptions ( ) . complianceLevel ) <= ( ClassFileConstants . JDK1_3 ) ) ) ) ) { if ( ! ( this . action . complainIfUnreachable ( actionInfo , scope , false ) ) ) { actionInfo = action . analyseCode ( scope , loopingContext , actionInfo ) . unconditionalCopy ( ) ; } exitBranch = flowInfo . unconditionalCopy ( ) . addInitializationsFrom ( condInfo . initsWhenFalse ( ) ) ; if ( ( ( ( actionInfo . tagBits ) & ( loopingContext . initsOnContinue . tagBits ) ) & ( FlowInfo . UNREACHABLE ) ) != 0 ) { continueLabel = null ; } else { actionInfo = actionInfo . mergedWith ( loopingContext . initsOnContinue ) ; loopingContext . complainOnDeferredFinalChecks ( scope , actionInfo ) ; exitBranch . addPotentialInitializationsFrom ( actionInfo ) ; } } else { exitBranch = condInfo . initsWhenFalse ( ) ; } if ( ! ( ( ( ( this . action ) == null ) || ( this . action . isEmptyBlock ( ) ) ) || ( ( ( this . action . bits ) & ( ASTNode . IsUsefulEmptyStatement ) ) != 0 ) ) ) { switch ( this . kind ) { case ForeachStatement . ARRAY : this . collectionVariable . useFlag = LocalVariableBinding . USED ; this . indexVariable . useFlag = LocalVariableBinding . USED ; this . maxVariable . useFlag = LocalVariableBinding . USED ; break ; case ForeachStatement . RAW_ITERABLE : case ForeachStatement . GENERIC_ITERABLE : this . indexVariable . useFlag = LocalVariableBinding . USED ; break ; } } loopingContext . complainOnDeferredNullChecks ( currentScope , actionInfo ) ; FlowInfo mergedInfo = FlowInfo . mergedOptimizedBranches ( loopingContext . initsOnBreak , false , exitBranch , false , true ) ; mergedInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( mergedInfo ) ; return mergedInfo ; } public void generateCode ( BlockScope currentScope , CodeStream codeStream ) { } public StringBuffer printStatement ( int indent , StringBuffer output ) { } public void resolve ( BlockScope upperScope ) { } public void traverse ( ASTVisitor visitor , BlockScope blockScope ) { } }

Fix:
this . collection . checkNPE ( currentScope , flowContext , flowInfo ) ;